904 HELIX. 



appears to be a magnified sketch ofTrochus vestiarius, which 

 has been copied from Bonanni. 



VORTEX. 40. Shell keeled, with the upper side 

 concave, and the base flat; aperture oval and 

 compressed. 



Helix Vortex. Linneeus Sj/st. Nat. p. 1243. Pennant 

 Zool. iv. p. 133. t, 83. f. 124. Schroeter Fluss. p. 228- 

 t. 5. f. l6 and 17, and Einl. ii. p. 134. Chemnitz, ix. 

 part 2. p. 100. t. 127. f. 1127. Gmelin, p. 3620. Do- 

 novan, iii. t. 75. Montagu Test. p. 454. t. 25. f. 3. Ma- 

 ton and Racket, in Ldn. Trans, viii. p. 1 89. Dorset Cat. 

 p. 52. t. 20. f. 12. 

 Helix Planorbis. Da Costa Brit. Conch, p. 65. t. 4. f. 12. 

 Planorbis Vortex. Muller Verm. ii. p. 158. 

 Le Planorbe a six spirales a arrete. Geoffroy, p. 93. No. 



5. t. 3. 

 Lister Anim. Ang. t. 2. f. 28, and Conch, t. 138. f. 43. 

 Petiver Gaz. t. 92. f. 6. Gualter, t. 4. f. G G. Klein 

 Ost. t. 1. f. 9. Martini Berl. Mag. iv. t. 8. f. 19. 

 Inhabits pools in Europe. Linnaus. England. Lister, France. 



Geoffroy. Denmark. Muller. 

 Shell about three-eighths of an inch in diameter, of a horn- 

 colour, or sometimes reddish brown, and covered when alive 

 with a blackish or greenish epidermis ; it has six or seven 

 narrow whirls, which are horizontally coiled, and the body- 

 whirl is keeled at its lower edge. 



SCABRA. 41. Shell ovate, imperforate, acuminated, 

 keeled, and striated transversely ; aperture 

 roundish, and the outer lip acute. 



Helix scabra. Linnceus Syst. Nat. p. 1243. Gmelin, p. 



3620. Chemnitz, xi. p. 283. t. 210. t. 2074 and 2075. 

 Lister Conch, t. 583. f. 37. 



Inhabits Jamaica. Lister. 



Shell about sixteen lines long, and half as broad, of a yellowish 

 or brownish colour, with transverse broken bands or darker 

 spots and crowded striae ; the shell which Chemnitz has 

 figured for this species in form somewhat resembles Trochus 

 zic-zac. 



GOTHicA. 42. Shell keeled, convex on both sides, 

 of a horn-colour, with sub-ferruginous bands. 



